Supplementary cementing materials in concrete
- Boca Raton CRC Press 2013
- xi, 190p. | Binding- Hard Bound | 23.8*16 cm
Supplementary cementing materials (SCMs), such as fly ash, slag, silica fume, and natural pozzolans, make a significant difference to the properties of concrete but are rarely understood in any detail. SCMs can influence the mechanical properties of concrete and improve its durability in aggressive environments. Supplementary Cementing Materials in Concrete covers the chemical, physical, and mineralogical properties of SCMs; their chemical reactions; and the resulting changes in the microstructure of concrete.
The author links the properties of the material at the microstructural level with its behavior in laboratory tests, and, in turn, to the performance of the material in concrete structures under field exposure. He explains how SCMs influence the mechanical properties of concrete and improve its durability and also covers how various SCMs influence hydration reactions and the evolution of the pore structure and pore-solution composition.
However, SCMs are not a panacea for concrete and improper use may be injurious to certain properties. Achieving the maximum benefit from SCMs requires an understanding of the materials and how they impact concrete properties under various conditions. Drawing on the author’s 30 years of experience, this book helps engineers and practitioners to optimize the use of supplementary cementing materials to improve concrete performance. CONTENT: Introduction Origin and Nature of SCM’s General Fly Ash Slag Silica Fume Natural Pozzolans
Chemical Reactions of SCM’s in Concrete Pozzolanic Reactions Hydration of Slag Effect of SCM’s on the Hydration of Portland Cement Effect of SCM’s on the Pore Solution Composition
Microstructure of Portland Cement – SCM Systems Pore Structure Interfacial Transition Zone, ITZ Pore Blocking and Mass Transport
Properties of Fresh Concrete Workability and Water Demand Bleeding Air Entrainment Setting Time
Temperature Rise and Risk of Thermal Cracking Temperature Rise Risk of Thermal Cracking
Mechanical Properties
Volume Stability Chemical and Autogenous Shrinkage Drying Shrinkage Creep Temperature Changes
Durability of Concrete Permeability Corrosion of Steel Reinforcement, Chloride Ingress and Carbonation Resistance to Freezing and Thawing, and De-Icer Salt Scaling Alkali-Silica Reaction (ASR) Sulfate Attack Heat-Induced Delayed Ettringite Formation "Physical" Salt Attack Other Forms of Chemical Attack Abrasion, Erosion and Cavitation
Specifications ASTM Specifications for SCM’s ASTM Specifications for Blended Cements – ASTM C 595 ASTM Performance Specification for Hydraulic Cements – ASTM C 1157